package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.commom.BaseContext;
import com.itheima.reggie.commom.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*
@date 2022年07月29日14:40
*/


@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public  static  final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;
         //1.获取本次请求的UrI
        String requestURI = request.getRequestURI();//backend/index.html
        log.info("拦截到请求:{}",requestURI);
        //2.判断本次请求的路径是否需要处理   静态资源,登录,登出不需要
        String[] urls=new String[]{
                "/backend/**",
                "/front/**",
                "/employee/login",
                "/employee/logout",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        boolean check=check(urls,requestURI);
        //3.如果不需要处理.直接放行;
         if(check){
             log.info("本次请求{}不要处理",requestURI);
             filterChain.doFilter(request,response);
            return;
         }
        //4.1后台管理员工判断是否为登录状态,,如果是登录状态直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("employee"));
            Long  empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
           return;
        }

        //4.12判断移动端是否为登录状态,,如果是登录状态直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("user"));
            Long  userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //5.如果未登录,则返回未登录结果
         log.info("用户未登录");
         response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
         return;
    }

    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
           boolean match=PATH_MATCHER.match(url,requestURI);
           if(match){
              return true;
           }
        }
        return false;
    }
}
